METHOD OF REMOVING UNSATURATED HYDROCARBONS FROM BENZENE Russian patent published in 2000 - IPC

Abstract RU 2157360 C1

FIELD: petrochemical processes. SUBSTANCE: benzene produced from petroleum product pyrolysis C₆-C₇-fractions is freed of unsaturated hydrocarbon impurities by extractive distillation with dimethylformamide, after which unsaturated hydrocarbons separated from benzene as head fraction are oligomerized at 150-170 C in presence of 0.0001-0.001% (based on the weight of benzene) of benzenesulfonic acid. Benzene distilled off from resulting oligomers is combined with benzene obtained as bottom fraction from extractive distillation column and freed of thiophene by known techniques. Purity of thus obtained benzene is at least 99.90 wt %. EFFECT: simplified process and increased purity of product. 1 dwg, 3 tbl, 3 ex

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RU 2 157 360 C1

Authors

Trofimov V.N.

Pantukh B.I.

Derevtsov V.I.

Dates

2000-10-10—Published

1999-08-18—Filed